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Emergency services were quickly on the scene, but nothing could be done to save the child.

Another boy, who was with Harrison, was taken to hospital but was physically unharmed.

This latest incident follows another earlier this month in Wednesbury, West Midlands, in which two 13-year-old boys were badly burned by overhead cables after playing next to rail lines.

Police have again urged parents of children to remind their youngsters not to trespass on the railway.

Superintendent Chris Hodgkiss, from BTP, said: "Our thoughts are with the family of the boy and we are doing all we can to understand exactly what led to Harrison's death.

"We understand news of this will also be devastating to his friends and the wider community, especially four boys who were with him when the incident happened.

"We are working closely with the rail industry and local partners, including Harrison's school, who are ensuring plans are in place to support pupils."

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He added: "We understand youngsters, particularly during the summer with lighter evenings, may be drawn to the railway but they are real tracks, with real trains and real-life consequences - be smart and stay away."

A spokesman for the terminal company said: "This is a tragic incident and our heartfelt condolences are with the young boy's family.

"We are working closely with police and Network Rail to establish the full cause of this tragedy."